Leath Cuinn
Encyclopedia
Leath Cuinn and Leath Moga (Mugh's half) refers to a legendary ancient division of Ireland.

Geographical extant

Leath Cuinn was the island north of the Esker Riada
Esker Riada
Esker Riada, , is a system of ridges that stretch across the middle of Ireland, between Dublin and Galway.-Geography:The Esker Riada is a collection of eskers, that passes through the counties of Dublin, Meath, Kildare, Westmeath, Offaly, Roscommon and Galway...

 (east-west drumlin belt from Dublin to Galway Bay). Conn Cétchathach, for whom this division is named, was a retrospective ancestor of the Connachta
Connachta
The Connachta are a group of medieval Irish dynasties who claimed descent from the legendary High King Conn Cétchathach...

 and Uí Néill
Uí Néill
The Uí Néill are Irish and Scottish dynasties who claim descent from Niall Noigiallach , an historical King of Tara who died about 405....

 dynasties.

Legendary origin of the term

As a result of the battle of Maigh Nuadad
Maynooth
Maynooth is a town in north County Kildare, Ireland. It is home to a branch of the National University of Ireland, a Papal University and Ireland's main Roman Catholic seminary, St. Patrick's College...

 in 123 A.D., where he was defeated by Eoghan Mor (also known as Mug Nuadat
Mug Nuadat
In Irish mythological history Mug Nuadat was a legendary, supposed King of Munster in the 2nd century AD. He was, according to later medieval tradition, a rival of the High King, Conn of the Hundred Battles and for a time after the year 123 was the de facto ruler of the southern half of Ireland...

, Conn was forced by Eoghan to accede to the division of Ireland into two halves:
  • The North
    Leath Cuinn
    Leath Cuinn and Leath Moga refers to a legendary ancient division of Ireland.-Geographical extant:Leath Cuinn was the island north of the Esker Riada...

     - taking in Connacht
    Connacht
    Connacht , formerly anglicised as Connaught, is one of the Provinces of Ireland situated in the west of Ireland. In Ancient Ireland, it was one of the fifths ruled by a "king of over-kings" . Following the Norman invasion of Ireland, the ancient kingdoms were shired into a number of counties for...

    , Ulster
    Ulster
    Ulster is one of the four provinces of Ireland, located in the north of the island. In ancient Ireland, it was one of the fifths ruled by a "king of over-kings" . Following the Norman invasion of Ireland, the ancient kingdoms were shired into a number of counties for administrative and judicial...

     and Meath - would be Conn's Half

  • The South - taking in Munster
    Munster
    Munster is one of the Provinces of Ireland situated in the south of Ireland. In Ancient Ireland, it was one of the fifths ruled by a "king of over-kings" . Following the Norman invasion of Ireland, the ancient kingdoms were shired into a number of counties for administrative and judicial purposes...

    , Osraighe and Leinster
    Leinster
    Leinster is one of the Provinces of Ireland situated in the east of Ireland. It comprises the ancient Kingdoms of Mide, Osraige and Leinster. Following the Norman invasion of Ireland, the historic fifths of Leinster and Mide gradually merged, mainly due to the impact of the Pale, which straddled...

     - would be Eoghan's Half.

Ramifications

To solidify the arrangement, Conn's daughter, Sadbh
Sadbh
In Irish mythology, Sadhbh was the mother of Oisín by Fionn mac Cumhail. She is either a daughter of Bodb Derg, king of the Síd of Munster, or may derive in part from Sadb ingen Chuinn, daughter of Conn of the Hundred Battles....

 was married to Ailill Aulom
Ailill Aulom
In Irish traditional history Ailill Ollamh , son of Mug Nuadat, was a king of the southern half of Ireland. Sabia, daughter of Conn of the Hundred Battles, was his wife. He divided the kingdom between his sons Éogan, Cormac Cas, and Cian. Éogan founded the dynasty of the Eóganachta...

, son of Eoghan.

The Eoganacht dynasty in Munster claimed, as descendants of Oiloill Olum, the historical right as overkings of Leath Moga (i.e. overlordship of Leinster as well as Munster) in the early medieval age, a claim disputed by the Ui Neill.
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